KYLIE Jenner just revealed her beautiful baby girl's surname following her big reveal on Sunday.

Kylie Jenner has revealed her baby girl's surname, by editing an Instagram photo of Stormi a day after sharing her first name with the world.

The Keeping Up With The Kardashians star sent fans into meltdown by posting the little girl's moniker on Tuesday, but she failed to mention whether the baby would have her surname, her father's second name, or indeed, a double barrel name.

The 20 year old mother has now revealed to fans on the social media site that her daughter with Travis, whose real name is Jacques Webster, is actually called Stormi Webster.

Kylie Jenner and baby Stormi [Instagram]

She went back to the original photo to change the full name and add an angel emoji.

Kylie Jenner and Travis Scott enjoy a rare date night together since welcoming baby Stormi as they step out in New York in July 2018
[SplashNews.com]

Kylie Jenner and Travis Scott's relationship timeline as the pair announce the birth of their baby daughter with adorable home video

One fan wrote online: "Butterfly in Kylie’s video probably refer to the butterfly effect theory that is why the baby’s girl name is stormi(sic)"

The scientific term, coined by Edward Lorenz, states that the flapping of the wings of a distant butterfly can produce huge weather formations across the globe weeks later. Meaning a very small change can create significantly bigger outcomes.